Commit-ID: 4ab8455f8bd83298bf7f67ab9357e3b1cc765c7d Gitweb: https://git.kernel.org/tip/4ab8455f8bd83298bf7f67ab9357e3b1cc765c7d Author: Jiri Olsa <[email protected]> AuthorDate: Wed, 3 Oct 2018 23:20:52 +0200 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Tue, 16 Oct 2018 08:18:52 -0300
perf evsel: Store ids for events with their own cpus perf_event__synthesize_event_update_cpus John reported crash when recording on an event under PMU with cpumask defined: root@localhost:~# ./perf_debug_ record -e armv8_pmuv3_0/br_mis_pred/ sleep 1 perf: Segmentation fault Obtained 9 stack frames. ./perf_debug_() [0x4c5ef8] [0xffff82ba267c] ./perf_debug_() [0x4bc5a8] ./perf_debug_() [0x419550] ./perf_debug_() [0x41a928] ./perf_debug_() [0x472f58] ./perf_debug_() [0x473210] ./perf_debug_() [0x4070f4] /lib/aarch64-linux-gnu/libc.so.6(__libc_start_main+0xe0) [0xffff8294c8a0] Segmentation fault (core dumped) We synthesize an update event that needs to touch the evsel id array, which is not defined at that time. Fixing this by forcing the id allocation for events with their own cpus. Reported-by: John Garry <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> Tested-by: John Garry <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Fixes: bfd8f72c2778 ("perf record: Synthesize unit/scale/... in event update") Link: http://lkml.kernel.org/r/20181003212052.GA32371@krava Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/builtin-report.c | 1 + tools/perf/util/evsel.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 76e12bcd1765..b2188e623e22 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -981,6 +981,7 @@ int cmd_report(int argc, const char **argv) .id_index = perf_event__process_id_index, .auxtrace_info = perf_event__process_auxtrace_info, .auxtrace = perf_event__process_auxtrace, + .event_update = perf_event__process_event_update, .feature = process_feature_event, .ordered_events = true, .ordering_requires_timestamps = true, diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 1a61628a1c12..e596ae358c4d 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1089,6 +1089,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts, attr->exclude_user = 1; } + if (evsel->own_cpus) + evsel->attr.read_format |= PERF_FORMAT_ID; + /* * Apply event specific term settings, * it overloads any global configuration.
